Which chemical equation shows that no atoms are lost during a chemical reaction?
a- 8fe + s8 > fes
b- 8fe + 8s8 > 8fes
c- fe + 8s8 > fes
d- 8fe + s8 > 8fes

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?

Which atomic model was proposed as a result of j. j. thomson’s work?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.